It's not rocket science - you have a RDS, your target is a long way away, say 400-600 yards - I'd start with aiming at the head or slightly over to get some COM hits on it, then adjust (I'm a 100yd zero guy).
I just think the concept of dialing a RDS is less than ideal, especially since most RDS guns are compact / SBR types so you are going to be fighting bullet velocity as well.
I'm sure it fits some entities desires, but not mine.
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